Bicycle frame



FIG. 1 is a front perspective view of a bicycle frame;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is an elevation view thereof, from the left side;

FIG. 6 is an elevation view thereof, from the right side; and,

FIG. 7 is a top plan view thereof.

The broken line showing of the bicycle frame is for the purpose of illustrating portions of the bicycle frame and forms no part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 